Answer:
slope: -1/2; y-intercept: (0,1); equation: y = -1/2(x) + 1
Explanation:
To find the slope, you use rise over run. This makes the slope from the graph 2/-4, because you rise 2 and go left 4, and left means negative. However, you want to simplify this and you get -1/2.
To find the y-intercept, all you do is find which point lies on the y-axis, which is (0,1).
Then, to find the equation, you put these values into the equation y = mx + b; m being the slope and b being the y-intercept